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Date:   Mon, 2 Aug 2021 08:48:39 +0200
From:   Sebastian Andrzej Siewior <bigeasy@linutronix.de>
To:     John Ogness <john.ogness@linutronix.de>
Cc:     chao.qin@intel.com, linux-kernel@vger.kernel.org,
        linux-rt-users@vger.kernel.org, tglx@linutronix.de,
        rostedt@goodmis.org, mgross@linux.intel.com, paul.mei@intel.com,
        lili.li@intel.com
Subject: Re: [PREEMPT_RT][PATCH] printk: Enhance the condition check of
 msleep in pr_flush()
Message-ID: <20210802064839.eukhmuxxv76uij3j@linutronix.de>
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On 2021-07-30 16:52:42 [+0206], John Ogness wrote:
> On 2021-07-30, Sebastian Andrzej Siewior <bigeasy@linutronix.de> wrote:
> > I don't have more context but scheduling should work starting with
> > SYSTEM_SCHEDULING.
> 
> I also thought this, but a quick test shows that is not the case. For
> example, init/main.c:kernel_init() is called in preemptible context, but
> msleep() will hang if called at the beginning of that function.

hmm. So the timer device is missing. Everything else is fine.

> John Ogness

Sebastian